drivers/gpu/drm/msm/msm_ringbuffer.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2013 Red Hat
   4  * Author: Rob Clark <[email protected]>
   5  */
   6
   7 #include "msm_ringbuffer.h"
   8 #include "msm_gpu.h"
   9
  10 static uint num_hw_submissions = 8;
  11 MODULE_PARM_DESC(num_hw_submissions, "The max # of jobs to write into ringbuffer (default 8)");
  12 module_param(num_hw_submissions, uint, 0600);
  13
  14 static struct dma_fence *msm_job_run(struct drm_sched_job *job)
  15 {
  16         struct msm_gem_submit *submit = to_msm_submit(job);
  17         struct msm_fence_context *fctx = submit->ring->fctx;
  18         struct msm_gpu *gpu = submit->gpu;
  19         struct msm_drm_private *priv = gpu->dev->dev_private;
  20         int i;
  21
  22         msm_fence_init(submit->hw_fence, fctx);
  23
  24         mutex_lock(&priv->lru.lock);
  25
  26         for (i = 0; i < submit->nr_bos; i++) {
  27                 struct drm_gem_object *obj = submit->bos[i].obj;
  28
  29                 msm_gem_unpin_active(obj);
  30         }
  31
  32         submit->bos_pinned = false;
  33
  34         mutex_unlock(&priv->lru.lock);
  35
  36         /* TODO move submit path over to using a per-ring lock.. */
  37         mutex_lock(&gpu->lock);
  38
  39         msm_gpu_submit(gpu, submit);
  40
  41         mutex_unlock(&gpu->lock);
  42
  43         return dma_fence_get(submit->hw_fence);
  44 }
  45
  46 static void msm_job_free(struct drm_sched_job *job)
  47 {
  48         struct msm_gem_submit *submit = to_msm_submit(job);
  49
  50         drm_sched_job_cleanup(job);
  51         msm_gem_submit_put(submit);
  52 }
  53
  54 static const struct drm_sched_backend_ops msm_sched_ops = {
  55         .run_job = msm_job_run,
  56         .free_job = msm_job_free
  57 };
  58
  59 struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu *gpu, int id,
  60                 void *memptrs, uint64_t memptrs_iova)
  61 {
  62         struct msm_ringbuffer *ring;
  63         long sched_timeout;
  64         char name[32];
  65         int ret;
  66
  67         /* We assume everywhere that MSM_GPU_RINGBUFFER_SZ is a power of 2 */
  68         BUILD_BUG_ON(!is_power_of_2(MSM_GPU_RINGBUFFER_SZ));
  69
  70         ring = kzalloc(sizeof(*ring), GFP_KERNEL);
  71         if (!ring) {
  72                 ret = -ENOMEM;
  73                 goto fail;
  74         }
  75
  76         ring->gpu = gpu;
  77         ring->id = id;
  78
  79         ring->start = msm_gem_kernel_new(gpu->dev, MSM_GPU_RINGBUFFER_SZ,
  80                 check_apriv(gpu, MSM_BO_WC | MSM_BO_GPU_READONLY),
  81                 gpu->aspace, &ring->bo, &ring->iova);
  82
  83         if (IS_ERR(ring->start)) {
  84                 ret = PTR_ERR(ring->start);
  85                 ring->start = NULL;
  86                 goto fail;
  87         }
  88
  89         msm_gem_object_set_name(ring->bo, "ring%d", id);
  90
  91         ring->end   = ring->start + (MSM_GPU_RINGBUFFER_SZ >> 2);
  92         ring->next  = ring->start;
  93         ring->cur   = ring->start;
  94
  95         ring->memptrs = memptrs;
  96         ring->memptrs_iova = memptrs_iova;
  97
  98          /* currently managing hangcheck ourselves: */
  99         sched_timeout = MAX_SCHEDULE_TIMEOUT;
 100
 101         ret = drm_sched_init(&ring->sched, &msm_sched_ops, NULL,
 102                              DRM_SCHED_PRIORITY_COUNT,
 103                              num_hw_submissions, 0, sched_timeout,
 104                              NULL, NULL, to_msm_bo(ring->bo)->name, gpu->dev->dev);
 105         if (ret) {
 106                 goto fail;
 107         }
 108
 109         INIT_LIST_HEAD(&ring->submits);
 110         spin_lock_init(&ring->submit_lock);
 111         spin_lock_init(&ring->preempt_lock);
 112
 113         snprintf(name, sizeof(name), "gpu-ring-%d", ring->id);
 114
 115         ring->fctx = msm_fence_context_alloc(gpu->dev, &ring->memptrs->fence, name);
 116
 117         return ring;
 118
 119 fail:
 120         msm_ringbuffer_destroy(ring);
 121         return ERR_PTR(ret);
 122 }
 123
 124 void msm_ringbuffer_destroy(struct msm_ringbuffer *ring)
 125 {
 126         if (IS_ERR_OR_NULL(ring))
 127                 return;
 128
 129         drm_sched_fini(&ring->sched);
 130
 131         msm_fence_context_free(ring->fctx);
 132
 133         msm_gem_kernel_put(ring->bo, ring->gpu->aspace);
 134
 135         kfree(ring);
 136 }